Seldom Seen
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as PDF Seldom Seen was completed in 2018.A timber construction Passive House designed around a traditional oak frame, the house was designed to be sympathetic to its rural setting; a small village in the North Wessex Downs AONB.The house is also designed to meet the needs of a severely disabled family member; including wider doors/corridors, integrated lift, specialist bath, hoists and changing table.
Seldom Seen : Project images
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Energy and fuel use
Measured data from renewable generation is not yet available.
Fuel use
| Pre-development | Forecast | Measured | |
| Electricity use | - | - | 5078 kWh/yr |
|---|---|---|---|
| Natural gas use | - | - | - |
| Oil use | - | - | - |
| LPG use | - | - | - |
| Wood use | - | - | - |
| Other Fuel | - | - | - |
| Pre-development | Forecast | Measured | |
| Primary energy requirement | - | - | 52 kWh/m².yr |
|---|---|---|---|
| Annual CO₂ emissions | - | - | 12 kg CO₂/m².yr |
| Annual space heat demand | - | 11 kWh/m².yr | - |
Renewable energy
| Electricity generation | Forecast | Measured |
|---|---|---|
| Renewables Technology | - | - |
| Other Renewables Tech | - | - |
| Electricity consumed by generation | - | - |
| Primary energy requirement offset by renewable generation | - | 52 kWh/m².yr |
| Annual CO₂ emissions offset by renewable generation | - | 12 kg CO₂/m².yr |
Calculation and targets
| Whole house energy calculation method | PHPP |
|---|---|
| Other whole house calculation method | - |
| Energy target | PassivHaus |
| Other energy targets | - |
| Forecast heating load | 8 W/m² demand |
Airtightness
| Date | Result | |
| Pre-development air permeability test | - | - |
|---|---|---|
| Final air permeability test | 30 January 2018 | 0.48m³/m².hr @ 50 Pascals |
Project description
| Stage | Occupied |
|---|---|
| Start date | 01 May 2017 |
| Occupation date | 17 January 2018 |
| Location | Devizes Wiltshire England |
| Build type | New build |
| Building sector | Private Residential |
| Property type | Detached |
| Construction type | Oak frame |
| Other construction type | Timber clad (oak) |
| Party wall construction | |
| Floor area | 245 m² |
| Floor area calculation method | Treated Floor Area (PHPP) |
| Building certification |  Passivhaus certified building |
Project Team
| Organisation | Erigo Ltd |
|---|---|
| Project lead person | Rebecca Thursby |
| Landlord or Client | |
| Architect | Hill Design |
| Mechanical & electrical consultant | Erigo Ltd / Current Electrical Solutions |
| Energy consultant | |
| Structural engineer | Clegg Associates |
| Quantity surveyor | Erigo Ltd |
| Consultant | |
| Contractor |
Design strategies
| Planned occupancy | Family of four; one disabled child, with carer when parents are out at work. |
|---|---|
| Space heating strategy | Under floor heating as back-up (not used) |
| Water heating strategy | Ground source heat pump with electric boiler |
| Fuel strategy | Mains electricity |
| Renewable energy strategy | |
| Passive Solar strategy | Most windows facing due south, with remainder on west and east elevations. Window proportions optimised using PHPP. |
| Space cooling strategy | Daytime use of MVHR with night purging during heat waves. |
| Daylighting strategy | |
| Ventilation strategy | Openable windows (only done at night time during the summer) |
| Airtightness strategy | Timber frame in-filled with Icyenene sprayfoam insulation (039) 228mm, with pro-passive board on interior, then plasterboard. Medite vent on the exterior of the spray foam (and then Tyvek wrap and timber-clad). |
| Strategy for minimising thermal bridges | Thermal bridging analysis undertaken for all primary junctions interfaces. Continuous insulation maintained throughout. Geometric thermal bridges minimised. Junctions assessed include: Ground floor junction, external corner, eaves, verge, window jamb, head and sill, door jamb, head and threshold. |
| Modelling strategy | |
| Insulation strategy | Application of Icyenene sprayfoam insulation (039) 228mm to external walls and roof to achieve U-value of 0.124 W/(m2K) |
| Other relevant retrofit strategies | |
| Contextual information | The primary purpose of the house was to enable better care of a severely disabled child. In the basic design, this meant a large open ground floor area (for wheelchair access) as well as space for equipment (sleeping, medical & bathing), wider corridors and doors, and a disabled lift.It also meant accommodating extra loads on the floors, walls and ceilings from ceiling hoists, a changing table and a specialist disabled bath. |
Building services
| Occupancy | Family of four (plus two large dogs); one of the family is a disabled child who remains at home (with carer) whilst parents go to work. |
|---|---|
| Space heating | Under floor heating and ethanol fire (neither required last winter) |
| Hot water | Ground source heat pump and electric boiler |
| Ventilation | Paul, Novus 300. Balanced PH ventilation with HREffective heat recovery efficiency 90.1% |
| Controls | Temp - feedback loop on underfloor heating (if switched on)MVHR - three settings |
| Cooking | Induction hob and double oven (electric) |
| Lighting | 100% LED lighting |
| Appliances | A++ fridge freezer and A+ washing machine & dishwasher |
| Renewable energy generation system | Not included in design, to fit in better to rural area. |
| Strategy for minimising thermal bridges |
Building construction
| Storeys | 2 |
|---|---|
| Volume | - |
| Thermal fabric area | - |
| Roof description | Timber frame, in-filled with Icyenene, sprayfoam insulation (039) 228mm, with pro-passive board on interior (then plasterboard) and medite vent on the exterior (then roof shield and tiles). |
| Roof U-value | 0.13 W/m² K |
| Walls description | Timber frame, in-filled with Icyenene, sprayfoam insulation (039) 228mm, with pro-passive board on interior and then plasterboard. External to sprayfoam is medite vent board, then Tyvek wrap and timber-clad (oak). |
| Walls U-value | 0.12 W/m² K |
| Party walls description | |
| Party walls U-value | - |
| Floor description | Insulated slab (Isoquick insulated raft) 200mm |
| Floor U-value | 0.13 W/m² K |
| Glazed doors description | Internorm triple-glazed sliding door |
| Glazed doors U-value | 0.98 W/m² K installed |
| Opaque doors description | 2 x external doors, both Internorm, one west-facing, one south-facing |
| Opaque doors U-value | 0.73 W/m² K installed |
| Windows description | Internorm triple-glazed 3N2-IL |
| Windows U-value | 0.89 W/m² K installed |
| Windows energy transmittance (G-value) | 50 % |
| Windows light transmittance | - |
| Rooflights description | Fakro quadruple glazed.U value included in calculation for 'Windows' (above) |
| Rooflights light transmittance | - |
| Rooflights U-value | - |